Guitar headstock



FIG. 1 is a front view of the guitar headstock showing my new design;

FIG. 2 is a right-side view;

FIG. 3 is a back view; and,

FIG. 4 is a is a left-side view.

The broken, dashed lines in the figures form no part of the claimed design and are only for illustrative purposes. 

I claim the ornamental design for a guitar headstock, as shown and described. 